Regex Tutorial - Introduction to Regular Expression

Topic

What is a Regular Expression?

Explanation

Regular Expression is a pattern or sequence of characters. This method is effectively used to match the specific pattern within a string and to extract the pattern of the string precisely to do various manipulations.Which may include splitting strings, replacing characters. Regular expression is one of the most powerful ways to do string manipulation,it is preferred to string functions for specific string manipulation needs.

This tutorial is aimed at the basic's of the Regular expression.That is to do string manipulation using the basic meta characters available in almost all languages in common.

Index of Regex Tutorial

1) Introduction	2) Metacharacter List	3) \-backslash
4) \|-pipe	5) ^-caret	6) $-dollar
7) .-dot	8) []-brace expression	9) \d-digit
10) \D-non digit	11) \n-newline	12) \s-whitespace
13) \S-non-whitespace	14) \w-word	15) \W-non word
16) \t-tabspace	17) \r-carriage return	18) Quantifiers
19) {}-braces	20) ?-question	21) *-asterisk
22) +-plus	23) Word Boundry	24) Non-word Boundry
25) [:alnum:] Character Class	26) [:alpha:] character class	27) [:blank:]
28) [:cntrl:] character class	29) [:digit:]	30) [:graph:] character class
31) [:lower:]	32) [:print:]	33) [:punct:]
34) [:space:] character class	35) [:upper:]	36) [:xdigit:]
37) Feedback

INTRODUCTION